US Bridges

Nfa A042 over N Fork Drainage Canal

FairPosted for load

McNairy County, Tennessee · 1 MI E of SR22 · Structure no. 550A0420001

Built
1977
48 years old
Condition
Fair
inspected August 2024
Type
Channel Beam
Concrete
Length
34 ft
2 main spans
Daily traffic
20
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A042 over N Fork Drainage Canal is a concrete channel beam carrying Nfa A042 over N Fork Drainage Canal in McNairy County, Tennessee. It was built in 1977, so it is 48 years old, older than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 20 vehicles a day, roughly 2% of them trucks, projected to reach 32 by 2040. The structure is 34 ft (10.4 m) long and 22 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesNfa A042
CrossesN Fork Drainage Canal
Location1 MI E of SR22
RouteCounty Highway 42
Coordinates35.31631, -88.37942
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.1 US tons
Inventory rating23.9 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadUnknown
Structure length34 ft (10.4 m)
Longest span17 ft (5.2 m)
Deck width22 ft (6.7 m)
Roadway width21 ft (6.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2020)
Projected traffic32 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A042 over N Fork Drainage Canal built?

It was built in 1977, making it 48 years old in 2025.

What condition is Nfa A042 over N Fork Drainage Canal in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2024.

How much traffic does Nfa A042 over N Fork Drainage Canal carry?

About 20 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A042 over N Fork Drainage Canal?

The structure is 34 ft (10.4 m) long with a longest span of 17 ft (5.2 m) and a deck 22 ft wide.

Who owns Nfa A042 over N Fork Drainage Canal?

It is owned by the County Highway Agency.